body{
    display: flex;
    flex-direction: column;
    align-items: center;
}
html,body{
    /*height: 100%;*/
    height: calc(100vh - 36px);
    background-color: #f1f1f1;
}
.head{
    width: 100%;
    height: 5%;
    min-height: 60px;
    box-shadow: 1px 0 10px 1px rgba(0,0,0,0.4);
    padding-left: 5%;
    background-color: #fff;
    margin-bottom: 5px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding-right: 5%;
}

.container-xl{
    height: auto;
    box-shadow: 1px 5px 5px 1px rgba(0,0,0,0.4);
    background-color: #f1f1f1;

}

.main-page{
    height:calc(100vh - 102px);
    min-height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.main-page>h1{
    margin-bottom: 10%;
}

.container-head{
    width: 100%;
    height: 5%;
    min-height: 50px;
}
.btn{
    margin-right: 10px;
    white-space:nowrap

}

.manage-msg{
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: calc(100vh - 192px);
}

form{
    width: 100%;
    display: flex;
    flex-direction: column;

}
form>input,select{
    margin-bottom: 5px;
}

form>span{
    width: 100%;
}

form>span>input[type='submit']{
    float: right;
}

